Solved: nrpe[]: Host 172.23.99.999 is not allowed to talk to us!
Today we will see one of the most common Nagios NRPE error message and its resolution. Lets see the error message and its resolution. I. Error Message [root@ngelinux001 ~]# service...
Tag: option
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How to run a command with root user in Ansible ?
In this post, we will see how to run a command with root user in ansible. There are two ways to do this. Lets have a look at both of...
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How to prevent users from saving/accessing certain files on a samba share in Linux ?
In Linux Samba server configuration, we have an interesting feature to turn off access on few files that matches a pattern. It helps to make some files disappear and those...
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Understanding /etc/fstab file and its dump option. Is it of any significance ?
Today in this article, we will see the importance of dump option in /etc/fstab file and will understand if its of any importance. To understand this, lets first look at...
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How to identify if our linux kernel is build with a specific option or not, for example if cgroup option is enabled during kernel build or not ?
Sometimes when you browse solution to some issue, you might have seen “make sure your kernel supports —- option i.e. during its build, this option is specified and enabled ?”...
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How to run ansible playbook on a single or multiple selected host(s) ?
Lets see how to run a playbook on a single selected host or multiple selected hosts. We can either make groups in hosts file or mention the host name using...
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Solved: GDB: (no debugging symbols found) error message.
Sometimes when we try to debug our program, we encounter the error message “no debugging symbols found”. Error “no debugging symbols found” [root@nglinux c_programs]# gdb 1hello.o GNU gdb (GDB) Red...
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How to disable crontab “-r” option in Linux ?
In this article, we will look at a trick how to disable crontab “-r” option in Linux. “E” and “R” lies nearby, hence there are chances while typing “crontab -e”,...
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How to debug python script for beginners ?
Recently i encountered an error in python script. And i was searching some way to debug the script. Luckily i got a way to do so by using python debugger(pdb)...